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I have the 3/4" bore for both cylinders on the Master Caster. I was referring to sizer for the 1 1/16 bore thinking I might need more power for sizing .45acp 233gr. boolits. I'm just not familiar of how much power I might need. Seems like it would be better to have more power with the bigger bore and use less psi.
I am using Hi-Tek coating so I'm not using any bullet lube.

Really? i never thought it would demand THAT much air if you dropped it back to a suitable pressure to get the job done, but you are the one that would know. The compressor i use is rates at 14 CFM, so air supply is not an issue.

I ended up putting the 1 1/16 bore on the sizer. Keep in mind this is a Lee Challenger turned upside down and I will manually put the boolit in the die. My compressor is a 5hp 33 gal tank so that is much more air than a pancake. I have the air cylinder mounted but am waiting on the clevis rod end. I hooked it up and it works great on the dry run with the ram attached.
I also started on the Master Caster. Got the brass tube cut for the standoffs and tapped the bracket. Did not get the aluminum top part made. I cut the 5" piece that the 5" throw air cylinder connects to. Also got it drilled and tapped for the cylinder and shoulder bolts. I'm a lot closer than I was a week ago.

I thought maybe you were down for some personal maintenance.
I've almost got it going except for the return spring. Instead of a single spring, I think I'm going from the center underneath where the clevis attaches, and have the spring attach from the corners to the center. My initial try sprung the spring. This thing is going to be really sweet once I get it fine tuned.
My wife says she'll be glad when I get it going so I'll quit watching your video a dozen times a night.

Finished hooking up the air to the MC today. Cast about 500 233 grain .45ACP. Works great but still needs a little tweaking. Had to remove the spring from under the lead drop lever so I could turn down the pressure to the mold release. I have to vary the pressure between 50-45 psi according to the temperature of the mold. Can't wait for the clevis to come in so I can hook up the sizer. I cooked about 1000 147g 9mm and about 200 of the .45 today so I'll have something to try it out on by this weekend.

Good to hear you have it running well. I know that mine always needs tweaking for each session, different moulds and different air temperatures make it cast slightly different. You soon learn it's sweet spot and it will run great.

Clevis came in today for the sizer. Not nearly enough power to size a 147g boolit without lube grooves. At 100psi, it needs 6 strokes to push it through the die. On the other hand, it only takes 2 and sometimes 3 strokes to size a 233g .45acp. So I have ordered a larger cylinder.